package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImp implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {
        //判断当前购物车加入的商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //如果存在数量加一
        if (list!=null && list.size()>0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        }else {
            //不存在则插入数据
            //判断加入进来的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                //传进来的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                //传进来的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }


    /**
     * 查看购物车
     *
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }


    /**
     * 清空购物车
     */
    @Override
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);

    }

    /**
     * 删除购物车的一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        //获取userId，根据userId查找对应的购物车
        Long userId = BaseContext.getCurrentId();
        //若是菜品，根据菜品id对数据库中菜品数量进行减一
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
            List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
            if (list!=null && list.size()>0){
                shoppingCart = list.get(0);
                //对菜品的数量进行判断,若数量为1则直接删除该数据
                if (shoppingCart.getNumber() == 1){
                    shoppingCartMapper.deleteById(shoppingCart);
                }else {
                    shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                    shoppingCartMapper.updateNumberById(shoppingCart);
                }
            }
    }
}
